<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>首页</title>
</head>
<body>
    <h1>希望服务器推送消息给我</h1>
    <script>
        // html5 原生支持websocket协议
        var ws=new WebSocket('ws://localhost:8080');
        // 事件 open 连接
        ws.onopen=function(){
            console.log('ws open');
            ws.send('form client : hello');
        }
        ws.onmessage=function(e){
            console.log('es onmessage');
            console.log('form server:'+e.data);
        }
    </script>
</body>
</html>